Feature request - Order refs by most recent activity in ref view, show unpulled/unpushed commits

[chingologram]

First of all, thanks for Tig.

I think the two features in the title would make the refs view much friendlier to use. Ordering I think is a must-have, as it is most likely that less traversing will be needed to access the desired branch. Showing unpulled/unpushed commits would remove extra steps to actively fetch and compare all recent branches for anything left out.